Artificial tooth.



J. KOHN.

ARTIFICIAL TOOTH.

APPLICATION FILED SEPT. 30, 1910.

1,052,832. Patented Feb. 11,1913.

A TTORNE Y JOSEPH KOI-IN, OF PHILADELPHIA, PENNSYLVANIA.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented Feb. 11,1913.

Application filed. September 30, 1910. Serial No. 584,659.

To all whom it may concern:

Be it known that I, JOSEPH KOHN, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented certain new and useful Improvements in Artificial Teeth,of which the following is a specification.

My invention relates to improvements in artificial teeth and it has forits object to provide a tooth which not only possesses advantages as acompleted article of manufacture but one in which the construction issuch that it may be cheaply and economically manufactured and withoutthe loss heretofore experienced due to fracturing and cracking of theteeth during their manufacture.

It is also an object of my invent-ion to provide an artificial toothhaving an improved construction of anchorage therein by means of whichthe attaching pins of the teeth may be readily and firmly secured inposition. The anchorage means is of such construction that it cooperateswith the means in the cavities of the molds for holding the anchoragesin the required positions in such a way as to facilitate the separationof the teeth from the molds after the same have been fired or biscuitedwhereby a decrease in the cost of manufacture is effected.

In the drawings :Figure 1 is a view in elevation of the inside surfaceof a tooth showing the ends of the pins secured therein; Fig. 2 is atransverse section on the line 22 of Fig. 1; Fig. 3 is a perspectiveView of the metallic anchorage adapted to be embedded in a tooth; andFig. 4 is a transverse section similar to that shown in Fig. 2 butshowing a modification of the structure.

Referring to the drawings, 5 designates a tooth having cavities therein,which cavities are generally speaking of T-shape. It should be noted,however, that the portions of the said cavities extending from the baseportions thereof to the inside surface of the tooth are of wedge-shape,the narrowest portion of the wedge being at the point where it joinswith the bottom or base portion of the cavity. Anchorage members 8 whichare also generally speaking of T-shape are secured in the said cavitieseach of which members consists of a strip of bendable material so bentas to form a T-head 9 which is seated in the base portion of the cavitywhich is of corresponding shape and the ends of the said strip extendoutwardly from I such T-head to the surface of the tooth being flared sothat the space between them is of wedge-shape, as is clearly shown inFig. 2.

Referring to Fig. 2, it will be noted that the sides 10 of the anchoragemembers at points adjacent to the T-head 9 thereof are substantially incontact.

18 designates pins the ends of which are beveled as indicated at 19 andthe beveled ends are placed in position between the inclined sides 10 ofthe anchorage members 8 and are permanently secured thereto by soldering. It will be noted that the ends of the wedges do not extend intocontact with the bottom or base part of the T-head of the anchoragemembers 8.

In Fig. 4 I have shown a construction in which the lower parts of thesides 20 of the anchorage members are separated from each other insteadof being substantially in contact as in the construction shown in thepre vious figures. Pins 21 in the construction shown in Fig. 4 arebeveled or inclined as indicated at 22 so that their sides contact withthe sides 20 of the anchorage. At the same time the inner ends ofthe'said pins extend bet-ween the bottom of the T-head as shown at 23.

It will be understood, of course, that the anchorage members 8 areplaced in position within a tooth when it is being molded and arepermanently secured therein when the same is biscuited or fired. It willbe noted that the pins 18 and 21 are provided with heads 24.

By arranging the sides of the anchorage members in such relation to eachother that they flare outwardly from the T-heads thereof to formV-shaped spaces as indicated in the drawing the removal of a tooth fromthe mold after it has been biscuited or fired, is greatly facilitated.Furthermore, an anchorage member is provided by my invention which notonly is very efficient as a means for securing the pins in place, butalso enables the economic and cheap construction of a tooth.

Having thus described my invention, I claim An artificial toothcomprising an anchorage member having a T-shaped head which is embeddedin the porcelain of the tooth during the molding of the same and whichname this 27th day of September, A. D. has arms Which diverge from theT-shaped 1910. head outwardly and a headed Wedge-shaped pin secured bysoldering between the said JOSEPH KOHN' 5 arms. In the presence of Intestimony that I claim the foregoing as Guns N. ANDERSON, my invention Ihave hereunto signed my CARRIE E. KLEINFELDER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

